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O-QAR optical quick access recorder
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O&M operations and maintenance
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O&S operating and support
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OAC oceanic area control center
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OAS oceanic automation system
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OASIS operational area satellite information system
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OASIS operational and supportability implementation system
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OASIS organic airborne and surface influence sweep
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OASYS obstacle avoidance system
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OAT operational acceptance test
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OAT outside air temperature
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OATS orbit and attitude tracking system
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OBP operational build plan
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OBS omnibearing selector
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OBS optical bypass switch
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OCA oceanic control area
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OCC occasionally connected computing
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OCC operations control center
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OCD oceanic clearance delivery
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OCIG Oceanic Communications Improvement Group
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OCP oceanic clearance processor
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OCTAS obstacle cable and terrain avoidance system
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ODA open document architecture
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ODAPS oceanic display and planning system
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ODIAC operational requirements for ATM air/ground data communications (Eurocontrol)
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ODID operational display and input development
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ODL oceanic data link
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ODL optical data link
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OEM original equipment manufacturer
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OEP Operational Evolution Partnership (FAA)
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OES Office of Emergency Services
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OEU overhead electronics unit
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OFDM orthogonal frequency division multiplexing
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OFDPS oceanic flight data processing system
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OFP operational flight program
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OGE operational ground equipment
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OHA operational hazard assessment
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OHSC overhead stowage compartments
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OHU overhead unit (HUD)
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OID object identifier
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OIG Office of Inspector General
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OIT onboard information terminal
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OJT on-the-job training
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OLAN onboard local area network
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OLDI on-line data interchange
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OLED organic LED
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OM outer marker
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OMB Office of Management and Budget (U.S.)
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OMS onboard maintenance system
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OMT object modeling technique
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OMT onboard maintenance terminal
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ONR Office of Naval Research (U.S.)
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OOA object-oriented analysis
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OOD object-oriented design
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OODA observe, orient, decide and act
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OOOI out/off/on/in
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OPA operational performance assessment
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OPAS overhead panel ARINC 629 system
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OPBC overhead panel bus controller
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OPD Optimized Profile Descent
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OPS operations
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OPS OPS per second
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OPSPECS OPS specifications
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OPU overspeed protection unit
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OR operational requirements
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ORB object request broker
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ORD operational requirements document
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ORD operations readiness demonstration
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OS open service
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OS operating system
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OSA operational safety assessment
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OSCAR Orbiting Satellite Carrying Amateur Radio
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OSDS oceanic systems development support
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OSE open systems environment
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OSED operational service and environment definition
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OSEIC operational service and environment information capture
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OSI open systems interface/interconnection
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OSIE OSI environment
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OSI-RM OSI-reference model
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OSJTF Open Systems Joint Task Force (U.S.)
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OSPF open shortest path first
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OSR order status report
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OSRVT One System Remote Video Terminal
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OTA Office of Technology Assessment (U.S.)
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OT&E operational test and evaluation
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OTFP operational traffic flow planning
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OTH over the horizon
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OTP Office of Telecommunications Policy (U.S.)
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OTS off the shelf
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OVHT overheat
